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Finding the Fourth Proportional to 13,687.10, 18,888.29 and 8,653.59

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Solution

The fourth proportional to 13,687.10, 18,888.29 and 8,653.59 is: 11,942.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.10 : 18,888.29 = 8,653.59 : x
  2. Step 2: Convert to fraction form
    13,687.10/18,888.29 = 8,653.59/x
  3. Step 3: Cross multiply
    13,687.10x = 18,888.29 × 8,653.59
  4. Step 4: Simplify right side
    13,687.10x = 163,451,474.19
  5. Step 5: Solve for x
    x = 163,451,474.19/13,687.10
  6. Step 6: Final answer
    x = 11,942.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.